GCN Circular 13564
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC), T. Okajima (GSFC), Y. Urata (NCU) We observed the field of GRB 120802A detected by Swift (trigger #529486; Holland et al., GCN Circ. 13555) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/). 30 images of 60 sec exposures were taken in the R filter starting from August 2 08:37:05 (UT) about 36 minues after the trigger and stopped on August 2 09:08:49 (UT). We do not detect the optical afterglow both in the individual images and the stacked image, which only combined 27 good quality images, inside the enhanced XRT position (Evans et al., GCN #13558). The estimated five sigma upper limit of the combined image (total exposure of 1620 sec) is ~17.2 mag using the USNO-B1 catalog.